Excavating bucket and cutter.



No. 848,743. PATENTED APR. 2, 1907.

- HBLM.

BXOAVATING BUCKET AND CUTTER.

APPLICATION Iii-ED MAB. '7, 1906.

JOHN HELM, OF ST. LOUIS, MISSOURI.

EXCAVATING BUCKET AND CUTTER.

Specification of Letters Patent.

Patented April 2, 1907.

Application filed March '7, 1906. Serial No. 804,614.

To all whom it may concern:

Be it known that I, JOHN HELM, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Excavating Buckets and Cutters, of which the following is a specification.

My invention relates to combined buckets and cutters as used more particularly in connection with excavating-machines.

The present invention is directed especially toward an improved form of cutter or digger.

The principal objects to be attained are to reduce the weight to a minimum consistent with proper strength and stiffness, to make it possible to renew only a portion of the cutting member in case of breakage at any point, and other objects hereinafter described and claimed.

My invention consists in the parts and in the arrangements and combinations of parts hereinafter described. and claimed.

In the accompanying drawings, forming a part of this specification, and wherein like symbols refer to like parts wherever they occur, Figure 1 is a side elevation of my bucket and cutter, partly in section, as indi cated at 1 1 of Fig. 3. Fig. 2 is a top plan View, and Fig. 3 is a front elevation.

My bucket and cutter comprises link members 1, which are provided with the usual opening 2 for connection with side links 3 of the bucket-chain.

The link members 1 extend rearwardly to form the rear side walls 4 of the bucket and are provided with flanges 5, to which a sheet iron or steel plate 6 is riveted to form the rear and bottom walls. also extend forward to form the bottom and side walls of the front part of the bucket. The forward integral part 7 is shaped to conform to the desired style of bucket. The forward part is completed by cutting members 8, 9, and 10, one along the forward edge and one on each side. To support these cutting members, the integral forward part of the bucket is cut down to form a shelf 11 the depth of the cutting members. The cutting members are provided with a recess 12 to receive the toe of said forward member, and

The link members 1 they are secured thereto by means of bolts 13. The side cutting members 9 and 10 pro ject beyond the line of the chain proper in order to provide clearance for the chain in digging the trench. The forward cutting member 8 is provided with serrated teeth 14., and the metal is cut out below the apex of each tooth, so that the metal remaining is substantially uniform in thickness from the cutting edge to the rear. By'forming the edge in this way the metal is worn away parallel to the original cutting j edge, and this maintains the same constantly sharp.

The cutting members are preferably made of cast-steel, and being formed in three separable sections it is necessary to replace only one of the sections in case of breakage.

Obviously my device is capable of considerable modification within the scope of my invention, and therefore I do not wish to be limited to the specific constructions shown and described.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A cutting-bucket for excavating-machines comprising a bucket proper, and a cutting member having a serrated cutting edge forming pointed and rigid teeth, the metal below the apex of each tooth being cut away to render the metal of substantially uniform thickness from cutting edge to base.

2. A cutting-bucket for excavating-machines comprising a bucket proper, a separable forward cutting member, and separable side cutting members adjacent to the ends of said forward member, and in 006psaid forward bottom portion having a seat name to this specification, in the presence of iorined thereln, a outtlng member having a two subscribing witnesses, this 3d day oi rearward fastening portion adapted to rest in March, 1906, at St. Louis, Missouri.

said seat, and also formed with a recess JOHN HELM. adapted to receive the forward edge of said Witnesses: bottom portion. WM. M. CADY,

In testimony whereof I have signed my J. B. MEGowN. 

